diff options
| author | Frederic Weisbecker <frederic@kernel.org> | 2021-02-01 00:05:44 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-04 12:15:31 +0100 |
| commit | 487e35b007b33dcb33366b4857a4f55772f5274e (patch) | |
| tree | 5f2946a17f8deef81712df19b15fc7735946b256 | |
| parent | 3546595217067838fff0dd49b3bf33577382bd9b (diff) | |
rcu: Pull deferred rcuog wake up to rcu_eqs_enter() callers
commit 54b7429efffc99e845ba9381bee3244f012a06c2 upstream.
Deferred wakeup of rcuog kthreads upon RCU idle mode entry is going to
be handled differently whether initiated by idle, user or guest. Prepare
with pulling that control up to rcu_eqs_enter() callers.
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20210131230548.32970-2-frederic@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | kernel/rcu/tree.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 40e5e3dd253e..63032e5620b9 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -644,7 +644,6 @@ static noinstr void rcu_eqs_enter(bool user) trace_rcu_dyntick(TPS("Start"), rdp->dynticks_nesting, 0, atomic_read(&rdp->dynticks)); WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && !user && !is_idle_task(current)); rdp = this_cpu_ptr(&rcu_data); - do_nocb_deferred_wakeup(rdp); rcu_prepare_for_idle(); rcu_preempt_deferred_qs(current); @@ -672,7 +671,10 @@ static noinstr void rcu_eqs_enter(bool user) */ void rcu_idle_enter(void) { + struct rcu_data *rdp = this_cpu_ptr(&rcu_data); + lockdep_assert_irqs_disabled(); + do_nocb_deferred_wakeup(rdp); rcu_eqs_enter(false); } EXPORT_SYMBOL_GPL(rcu_idle_enter); @@ -691,7 +693,14 @@ EXPORT_SYMBOL_GPL(rcu_idle_enter); */ noinstr void rcu_user_enter(void) { + struct rcu_data *rdp = this_cpu_ptr(&rcu_data); + lockdep_assert_irqs_disabled(); + + instrumentation_begin(); + do_nocb_deferred_wakeup(rdp); + instrumentation_end(); + rcu_eqs_enter(true); } #endif /* CONFIG_NO_HZ_FULL */ |